System Design Interview Fundamentals by Liu Rylan

Author:Liu, Rylan [Liu, Rylan]
Language: eng
Format: epub
Published: 2021-08-02T00:00:00+00:00

Depending on the frequency of the backup, the disadvantage is the data might be outdated. Also, it takes time to uncompress the files and recreate the snapshot in time.

Depending on your requirements, an out-of-date snapshot might be acceptable. Frequency of snapshot makes a good trade-off discussion with the interviewer between frequency against the freshness requirement.

Option 2: Write-Ahead Log (WAL)

Before writing to the cache, you write to a write-ahead log (WAL) to disk. Since WAL is append-only, the operation is fast. In the example below, let’s assume the cache fails after 2 WAL blocks. The 3 WAL blocks can regenerate the cache.

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